• 한국작물학회지
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• 제43권2호
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• pp.95-100
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• 1998

Seedling establishment of soybean [Glycine mar (L.) Mer-rill] is an important factor for soybean production in the field. The objective of this study was to determine the distribution of chemical composition in the emerging organs during seedling development in soybeans. Three soybean cultivars (Hill, Paldalkong, and Jangyeobkong) were planted at the Research Farm of College of Natural Resources, Korea University, on May 26, June 5, and June 14. Protein, oil, sugar, and starch contents were measured in each organ at each developing stage. Mean dry weight of three soybean cultivars decreased until VE stage and increased after this stage. Protein content of whole seedling did not change significantly during the seedling growth stage, but the amount in cotyledons markedly decreased with each growth stage increment. About 88% of the cotyledon protein was translocated to the other parts of the seedling at the V2 stage. Oil content of cotyledons sharply decreased until the V1 stage. Sugar content of the seedling was not detected at VE stage and starch content of seedlings increased slightly at VE and VC stages. For the changes of each metabolic component, the amount for whole plants decreased until the V1 stage and started to increase after this stage. The results of this study provide evidence for the breakdown of carbohydrates and oil at the initial stage of seedling growth.

• 한국작물학회지
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• 제50권2호
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• pp.120-124
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• 2005

Expanded rice husk (ERR) is different from commercial rice seedling media in chemical and physical properties such as pH, permeability, and water content. This study was conducted to test a possibility of improving rice seedling growth by improving the texture of ERR as a rice seedling medium. The seedling media used were a commercial seedling medium (CSM), rice husk, and ERR 1, 2, 3, and 4 with different expansion degrees. The pH of the ERHs ranged from 6.3 to 6.8. As the expansion rate increased, ERR particle sizes decreased, and water permeability and absorption rates improved. No significant differences in shoot dry weight and rate of maturity were found among the seedlings cultivated in the different ERH media. However, the mat formation of seedling roots became loose as the expansion rates were decreased. Further studies are necessary to determine the cause of poor root growth in ERH media.

• 한국연초학회지
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• 제14권1호
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• pp.42-47
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• 1992

This study was conducted to determine the effects of the bottom watering method on seedling growth, temperature of seedbed and working hours. The results of compared conventional watering with bottom watering were as follows: 1. The lowest and highest temperature on surface of bottom watering seedbed were higher about 2-3$^{\circ}C$ and 3-5$^{\circ}C$ than those of conventional plot, respectively. 2. At 30 days after seeding, flesh and dry weight of seedling in bottom watering seedbed were heavier about 121% and 62% than those of seedling in conventional plot, respectively, while dry ratio of that was lower about 30.2%. 3. Plant height of transplanting seedling in bottom watering seedbed was higher about 4-5cm than that of seedling in conventional plot. Otherwise, ratio of top to root and length of root were not significant. 4. Working hours of bottom watering for growing seedling were reduced 40.9% and 53.4% in primary and secondary seedbeds as compared with those of conventional plot, respectively.

• 생물환경조절학회지
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• 제29권2호
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• pp.181-188
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• 2020

본 연구는 국내 특산식물이며 관상소재로 개발이 가능한 산꼬리풀의 효과적인 육묘조건을 구명하기 위해 수행되었다. 육묘는 토양 종류와 비료 농도, 차광정도, 추비 농도, 종자의 광원 전처리 및 채종 시기별로 각 요인을 달리하여 수행하였다. 연구 결과, 산꼬리풀은 원예상토에서 생육이 우수하였으며, 혼용토에서는 비료 첨가 시 생육이 억제되었다. 차광은 55% 차광조건에서 무차광에 비해 전체적인 생육이 향상되었다. 고농도(1000mg·L^-1)의 Hyponex는 육묘 시 생육을 촉진하였으며, 파종 전 종자에 대한 적색광 조사는 추후 초장과 생체중 향상에 효과적이었다. 채종 시기는 2018년도 종자가 2017년 종자보다 생육이 우수하였다.

• 현장농수산연구지
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• 제16권1호
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• pp.17-24
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• 2014

Growth Chamber에서 철분코팅 벼종자와 무처리 볍씨의 발아 및 입묘 특성을 구명하기 위하여 유묘의 입모율, 경시적 입묘양상의 변화, 초장, 엽수, 근장, 근수, 생체중의 특성을 조사결과를 요약하면 다음과 같다. 1. 입모율은 철분코팅 95%, 무처리 95%로 매우 높은 결과를 보였으며, 벼 출아소요일수는 출아가 13~14일 소요되는 것으로 나타났으며, 철분코팅볍씨가 무처리 볍씨보다 전반적으로 출아가 빠르게 나타났다. 2. 벼 유묘의 초장에서는 철분코팅볍씨 4.9cm, 무처리볍씨 3.4cm로, 엽수는 철분코팅볍씨 3.8개, 무처리볍씨 3.3개로 각각 나타났다. 3. 유묘의 뿌리 철분코팅볍씨 3.8cm로 무처리볍씨 0.4cm보다 9.5배 최장 뿌리 길이가 긴 것으로 나타났으나, 뿌리수는 철분코팅볍씨 6.8개, 무처리볍씨 5.5개로 비슷한 수준으로 나타났다. 4. 유묘의 생체중은 철분코팅볍씨 107mg, 무처리 볍씨 66mg로 각각 나타났다.

• The Plant Pathology Journal
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• 제24권1호
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• pp.58-62
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• 2008

Utilization of carbon sources by Bacillus cereus D324, a biological control agent, and Pythium species, which causes rice seedling disease, was studied with the objective of increasing the efficacy of biological control by providing the biological control agent with specific beneficial carbon sources. D-galactose, D-sorbitol, and D-mannitol were poor carbon sources for Pythium spp. growth but were good for B. cereus D324 growth. Growth in a growth chamber of rice seeds coated with B. cereus D324 amended with specific carbon sources, such as D-galactose and D-sorbitol, showed significantly enhanced seedling emergence compared to seeds coated only with B. cereus D324. Field trials showed that both seedling emergence and yield increased, when the above specific carbon sources were added to B. cereus D324 in seed coating formulations. This result indicated that amending seed coating formulations with specific carbon sources could significantly increase seedling emergence and yield in the field.

• Journal of Ginseng Research
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• 제5권2호
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• pp.92-98
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• 1981

This experiment was carried out to inverstigate the characteristics of growth of ginseng Plant on field conditions as affected by seedling weight. Weight of seedling ranged from 0.4 to 1.8g were divided into seven classes at interval of 0.2g. The heavy seedlings showed superiority in stem length, stem diameter, leaf area, number of palmate leaf and leaflets and root weight in 2-,3-, and 4-age as compared to light ones. The heavy seedlings also showed superiority in the ratio of inflorescence appearance in 2-age and seed product in 4-age as compared to light ones, but there were no significant difference in the ratio of missing-plant and the cracking. of root. The differences of growth in field condition as affected by seedling weight were diminished as the age progressed, and the annual growth rates of root of light seedling were high in older plant.

• Journal of Ginseng Research
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• 제4권1호
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• pp.65-71
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• 1980

Twin-bud seedlings and four-leaflet seedlings of ginseng were found and transplanted to field and their growth characteristics were investigated. 1. Appearance frequencies of twin-bud and four-leaflet seedlings were 0.3 and 0.4 percent, respectively, in common nursery bed: and were 6.6 and 28.4 percent, respectively, in polystem line. 2. Generally, the growth of twin.bud and four-leaflet seedlings were better than those of common seedlings both in aerial part and in root. Root weights of both type seedlings exceeded the common ones by 66 and 38 percent, respectively. 3. When they became two-year-old plants, leafiet number of common plant was 11.6, and those of twin-bud and four-leaflet-seedling plants were 18.1 and 13.8, respectively. There were no inflorescence in twin-bud-seedling plant, but the ratios of in florescent Plant in four-leaflet.seedling and common plant were 44.0 and 12.5 percent, respectively. 4. In two-year-old plant, root weights of twin-bud and four-leaflet-seedling plants were heavier than those of common ones by 27 and 20 percent, respectively.

• 한국자원식물학회지
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• 제11권3호
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• pp.290-295
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• 1998

Presowing treatements to seed are reasonable for elevating the seedling production efficiency. This experiment was carried out to determine the effects of $GA_3$ [0 (water) : 0.01 mM] and light qulaity (red : white) simultaneously treated before sowing on seedling emergence and growth of tobacco (Nicotiana tabacum L.) cv NC 82 and Burley 21. Red or white light was illuminated 12 hours a day while seeds of the cultivars were imbibed with either water or $GA_3$ 0.01 mM for 3 days. Seedling emergence was measured up to 20 days after sowing but morphological characters and dry weights were done 40 days. The seedling emergence rate of cv NC 82 was more affected by light quality and $GA_3$ pretreatments than that of cv Burley 21. Light quality more influenced the rate than $GA_3$ while red light or water imbibition enhanced the rates of the two cultivars compared to the other treatement. Although mean plant height and leaf number per seedling were nearly equal between the treatements, red light declined leaf area per seedling of cv Burley 21 of which seeds were imbibed in water but white light decreased the areas of both cultiars of which seeds were soaked in $GA_3$solution. Shoot dry weight was greater in cv NC 82 but less in cv Burley 21 pretreated with red light, and root dry weight showed the reverse result in white light, meaning that presowing light and $GA_3$ treatments could be changed the seedling development and growth of tobacco.

• 한국약용작물학회지
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• 제2권2호
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• pp.114-120
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• 1994

최근 생약의 수요 및 재배면적이 증가됨에 따라 약초의 재배기술 확립이 요청 되고 있는바 추대로 인한 수량감소와 품질저하가 크다고 알려진 강활에 대하여 파종방법별로 육묘기 생육과 묘크기에 따른 추대 및 수량성을 구명하고자 시험한 결과는 다음과 같다. 1. 파종방법별 출아율은 파종량이 적고 산파했을 경우에 높아지는 경향을 보였고 묘크기에 있어서는 파종량간에 대차 없었으나 파종방법간에는 조파구에서 생장량이 많은 경향이었다. 2. 묘 분포비율은 중묘>소묘>대묘의 순으로 많았는데 소묘생산을 위해서는 산파로서 밀파$(8l\;/33m^2)$ 하는 것이 유리 한 것으로 나타났다. 3. 묘크기에 따른 정식후 생육은 묘의 근경이 굵을수록 개화가 빨라지는 경향이었고 지상부 생육은 조파 소묘 정식이 좋은 경향이었다. 4. 묘크기에 따른 추대율은 대묘 89.6%, 중묘 64.4%, 소묘 36.9% 로 묘가 클수록 높았다. 5. 묘크기에 따른 근비대는 미추대근이 추대근에 비하여 많았고 조파묘보다 산파 묘가 좋았다. 6. 생근수량은 산파 소묘 정식구에서 853kg/10a 으로 가장 증수하였다.